// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/sync_socket.h"

#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/types.h>

#include "base/logging.h"

namespace base {

const SyncSocket::Handle SyncSocket::kInvalidHandle = -1;

SyncSocket::SyncSocket()
    : handle_(kInvalidHandle)
{
}

SyncSocket::~SyncSocket()
{
    Close();
}

// static
bool SyncSocket::CreatePair(SyncSocket* socket_a, SyncSocket* socket_b)
{
    return false;
}

// static
SyncSocket::Handle SyncSocket::UnwrapHandle(
    const SyncSocket::TransitDescriptor& descriptor)
{
    // TODO(xians): Still unclear how NaCl uses SyncSocket.
    // See http://crbug.com/409656
    NOTIMPLEMENTED();
    return SyncSocket::kInvalidHandle;
}

bool SyncSocket::PrepareTransitDescriptor(
    ProcessHandle peer_process_handle,
    SyncSocket::TransitDescriptor* descriptor)
{
    // TODO(xians): Still unclear how NaCl uses SyncSocket.
    // See http://crbug.com/409656
    NOTIMPLEMENTED();
    return false;
}

bool SyncSocket::Close()
{
    if (handle_ != kInvalidHandle) {
        if (close(handle_) < 0)
            DPLOG(ERROR) << "close";
        handle_ = kInvalidHandle;
    }
    return true;
}

size_t SyncSocket::Send(const void* buffer, size_t length)
{
    const ssize_t bytes_written = write(handle_, buffer, length);
    return bytes_written > 0 ? bytes_written : 0;
}

size_t SyncSocket::Receive(void* buffer, size_t length)
{
    const ssize_t bytes_read = read(handle_, buffer, length);
    return bytes_read > 0 ? bytes_read : 0;
}

size_t SyncSocket::ReceiveWithTimeout(void* buffer, size_t length, TimeDelta)
{
    NOTIMPLEMENTED();
    return 0;
}

size_t SyncSocket::Peek()
{
    NOTIMPLEMENTED();
    return 0;
}

CancelableSyncSocket::CancelableSyncSocket()
{
}

CancelableSyncSocket::CancelableSyncSocket(Handle handle)
    : SyncSocket(handle)
{
}

size_t CancelableSyncSocket::Send(const void* buffer, size_t length)
{
    return SyncSocket::Send(buffer, length);
}

bool CancelableSyncSocket::Shutdown()
{
    return SyncSocket::Close();
}

// static
bool CancelableSyncSocket::CreatePair(CancelableSyncSocket* socket_a,
    CancelableSyncSocket* socket_b)
{
    return SyncSocket::CreatePair(socket_a, socket_b);
}

} // namespace base
